GeetCode Hub

  1. Home
  2. GeetCode
  3. GeetCode Hub

We are given head, the head node of a linked list containing unique integer values.

We are also given the list nums, a subset of the values in the linked list.

Return the number of connected components in nums, where two values are connected if they appear consecutively in the linked list.

Example 1:

Input: 
head: 0->1->2->3
nums = [0, 1, 3]
Output: 2
Explanation: 
0 and 1 are connected, so [0, 1] and [3] are the two connected components.

Example 2:

Input: 
head: 0->1->2->3->4
nums = [0, 3, 1, 4]
Output: 2
Explanation: 
0 and 1 are connected, 3 and 4 are connected, so [0, 1] and [3, 4] are the two connected components.

Note:

  • If n is the length of the linked list given by head, 1 <= n <= 10000.
  • The value of each node in the linked list will be in the range [0, n - 1].
  • 1 <= nums.length <= 10000.
  • nums is a subset of all values in the linked list.

/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode() : val(0), next(nullptr) {} * ListNode(int x) : val(x), next(nullptr) {} * ListNode(int x, ListNode *next) : val(x), next(next) {} * }; */ class Solution { public: int numComponents(ListNode* head, vector<int>& nums) { } };